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Slowly back off sampling rate when selected source loses connectivity

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This commit is contained in:
Miroslav Lichvar 2010-12-06 14:53:37 +01:00
parent 4e318c1abc
commit 8b93e1a780
1 changed files with 6 additions and 13 deletions
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19
ntp_core.c
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@ -645,20 +645,13 @@ transmit_timeout(void *arg)
/* Nothing */
}
/* If the source to which we are currently locked starts to lose
connectivity, increase the sampling rate to try and bring it
back. If any other source loses connectivity, back off the
sampling rate to reduce wasted sampling. */
/* If the source loses connectivity, back off the sampling rate to reduce
wasted sampling. If it's the source to which we are currently locked,
back off slower. */
if (SRC_IsSyncPeer(inst->source)) {
if (inst->tx_count >= 2) {
/* Implies we have missed at least one transmission */
adjust_poll(inst, -0.75);
}
} else {
if (inst->tx_count >= 2) {
adjust_poll(inst, 0.25);
}
if (inst->tx_count >= 2) {
/* Implies we have missed at least one transmission */
adjust_poll(inst, SRC_IsSyncPeer(inst->source) ? 0.1 : 0.25);
}
my_mode = inst->mode;